Update to Bootstrap4

.bowerrc

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+{
+  "directory": "bower_components"
+}

.directory

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+[Dolphin]
+Timestamp=2016,11,22,22,31,23
+Version=3
+
+[Settings]
+HiddenFilesShown=true

.editorconfig

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+# editorconfig.org
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.github/CONTRIBUTING.md

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+Please read [Contributing to Roots Projects](https://github.com/roots/guidelines/blob/master/CONTRIBUTING.md)

.github/ISSUE_TEMPLATE.md

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+## Submit a feature request or bug report
+
+- [ ] This is a feature request
+- [ ] This is a bug report
+- [ ] This request isn't a duplicate of an [existing issue](https://github.com/roots/sage/issues)
+- [ ] I've read the [docs](https://roots.io/sage/docs) and [NPM Debugging Guidelines post](https://discourse.roots.io/t/npm-debugging-guidelines-failed-npm-install-bower-install-or-gulp-build-read-this/3060) and followed them (if applicable)
+- [ ] This is not a personal support request that should be posted on the [Roots Discourse](https://discourse.roots.io/c/sage) forums
+
+Replace any `X` with your information.
+
+---
+
+**What is the current behavior?**
+
+X
+
+
+**What is the expected or desired behavior?**
+
+X
+
+---
+
+## Bug report
+
+(delete this section if not applicable)
+
+**Please provide steps to reproduce, including full log output:**
+
+X
+
+**Please describe your local environment:**
+
+WordPress version: X
+
+OS: X
+
+NPM/Node version: X
+
+**Where did the bug happen? Development or remote servers?**
+
+X
+
+
+**Is there a related [Discourse](https://discourse.roots.io/) thread or were any utilized (please link them)?**
+
+X
+
+---
+
+## Feature Request
+
+(delete this section if not applicable)
+
+**Please provide use cases for changing the current behavior:**
+
+X
+
+**Other relevant information:**
+
+X

.gitignore

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+# Include your project-specific ignores in this file
+# Read about how to use .gitignore: https://help.github.com/articles/ignoring-files
+dist
+bower_components
+node_modules
+npm-debug.log
+vendor
+DEVLOG.md

.jscsrc

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+{
+  "requireCurlyBraces": [
+    "if",
+    "else",
+    "for",
+    "while",
+    "do",
+    "try",
+    "catch"
+  ],
+  "requireOperatorBeforeLineBreak": true,
+  "requireCamelCaseOrUpperCaseIdentifiers": true,
+  "maximumLineLength": {
+    "value": 80,
+    "allowComments": true,
+    "allowRegex": true
+  },
+  "validateIndentation": 2,
+  "validateQuoteMarks": "'",
+  "disallowMultipleLineStrings": true,
+  "disallowMixedSpacesAndTabs": true,
+  "disallowTrailingWhitespace": true,
+  "disallowSpaceAfterPrefixUnaryOperators": true,
+  "disallowMultipleVarDecl": true,
+  "disallowKeywordsOnNewLine": [
+    "else"
+  ],
+  "requireSpaceAfterKeywords": [
+    "if",
+    "else",
+    "for",
+    "while",
+    "do",
+    "switch",
+    "return",
+    "try",
+    "catch"
+  ],
+  "requireSpaceBeforeBinaryOperators": [
+    "=",
+    "+=",
+    "-=",
+    "*=",
+    "/=",
+    "%=",
+    "<<=",
+    ">>=",
+    ">>>=",
+    "&=",
+    "|=",
+    "^=",
+    "+=",
+    "+",
+    "-",
+    "*",
+    "/",
+    "%",
+    "<<",
+    ">>",
+    ">>>",
+    "&",
+    "|",
+    "^",
+    "&&",
+    "||",
+    "===",
+    "==",
+    ">=",
+    "<=",
+    "<",
+    ">",
+    "!=",
+    "!=="
+  ],
+  "requireSpaceAfterBinaryOperators": true,
+  "requireSpacesInConditionalExpression": true,
+  "requireSpaceBeforeBlockStatements": true,
+  "requireSpacesInForStatement": true,
+  "requireLineFeedAtFileEnd": true,
+  "requireSpacesInFunctionExpression": {
+    "beforeOpeningCurlyBrace": true
+  },
+  "disallowSpacesInAnonymousFunctionExpression": {
+    "beforeOpeningRoundBrace": true
+  },
+  "disallowSpacesInsideObjectBrackets": "all",
+  "disallowSpacesInsideArrayBrackets": "all",
+  "disallowSpacesInsideParentheses": true,
+  "jsDoc": {
+    "checkParamNames": true,
+    "requireParamTypes": true
+  },
+  "disallowMultipleLineBreaks": true,
+  "disallowNewlineBeforeBlockStatements": true
+}

.jshintrc

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+{
+  "bitwise": true,
+  "browser": true,
+  "curly": true,
+  "eqeqeq": true,
+  "eqnull": true,
+  "esnext": true,
+  "immed": true,
+  "jquery": true,
+  "latedef": true,
+  "newcap": true,
+  "noarg": true,
+  "node": true,
+  "strict": false
+}

.travis.yml

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+sudo: false
+language: php
+php:
+  - nightly
+  - 5.6
+  - 5.5
+  - 5.4
+  - hhvm
+
+matrix:
+  allow_failures:
+    - php: nightly
+
+cache:
+  directories:
+    - bower_components
+    - node_modules
+
+install:
+  - npm install -g npm@latest
+  - npm install -g bower gulp jscs
+  - npm install
+  - composer self-update && composer --version
+  - export PATH="$HOME/.composer/vendor/bin:$PATH"
+  - composer global require squizlabs/php_codesniffer
+
+script:
+  - npm run build
+  - npm run jshint
+  - npm run jscs
+  - phpcs --standard=ruleset.xml --extensions=php -n -s .

404.php

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+<?php get_template_part('templates/page', 'header'); ?>
+
+<div class="alert alert-warning">
+  <?php _e('Sorry, but the page you were trying to view does not exist.', 'sage'); ?>
+</div>
+
+<?php get_search_form(); ?>