Feature/multiple updates

[frenck]

Created a pretty big update, however, most of the changes are repository related.

Toolset changes:

• Added Humbug to the list of tools
• Added Phing to the list of tools
• Added Deployer to the list of tools
• Updated dealerdirect/phpcodesniffer-composer-installer version constrain to ^0.3.0
• Updated sebastian/phpcpd version constrain to ^3.0.0
• Updated phpmetrics/phpmetrics version constrain to ^2.0.0
• Removed ocramius/proxy-manager version lock: global bug has been resolved. See: Fixed issue with Ocramius Package Versions and PHP 7 #9

Repository / CI changes:

• Added GitHub issue / pull templates
• Added / Activated GrumPHP on this repository
• Updated TravisCI to test against PHP 7.1 as well
• Updated TravisCI to run shellcheck against the install.sh script
• Updated TravisCI to verify GPG signature of the install.sh script matches
• Updated TravisCI to verify the syntax of JSON files
• Updated TravisCI to verify the syntax and styling of YAML files
• Updated repository & TravisCI to test against our Markdown coding standards
• Updated repository & TravisCI to test against profanities using Alex in Markdown files
• Updated repository & TravisCI to test against spelling errors in Markdown files
• Updated all Markdown files to match our coding standards
• Updated licenses to include the year 2017

[Potherca]