Replace codeclimate with coveralls

Codeclimate uses very outdated version of JSHint and has no intent of
updating it (I asked in May, the answer was "soon", but its October
now and its still not updated).
Amount of false positives on codeclimate now is far more then it will
be acceptable to be useful, so we are leaving it.
For coverage reports we will be using coveralls now, and for linting
`npm run lint` on Travis will suffice.

.travis.yml

@@ -8,7 +8,7 @@ before_install:
 script:
 - npm run lint
 - npm test --coverage
-after_success: cat ${TRAVIS_BUILD_DIR}/coverage/lcov.info | codeclimate
+after_success: cat ${TRAVIS_BUILD_DIR}/coverage/lcov.info | coveralls
 addons:
   code_climate:
     repo_token: e530b4958df125177f497dc6e2eb11080ce4b640eba7a4856e7b4932fe2d8997

README.md

@@ -2,8 +2,7 @@ Gemini Quick Start
 =======
 
 [![Build Status](https://travis-ci.org/bem/gemini.svg?branch=master)](https://travis-ci.org/bem/gemini)
-[![Code Climate](http://img.shields.io/codeclimate/github/bem/gemini.svg)](https://codeclimate.com/github/bem/gemini)
-[![Coverage](http://img.shields.io/codeclimate/coverage/github/bem/gemini.svg)](https://codeclimate.com/github/bem/gemini)
+[![Coverage Status](https://img.shields.io/coveralls/bem/gemini.svg)](https://coveralls.io/r/bem/gemini)
 
 [Gemini](https://github.com/bem/gemini) is the utility for regression testing of web pages appearance.
 

package.json

@@ -25,7 +25,7 @@
     "minimatch": "~1.0.0"
   },
   "devDependencies": {
-    "codeclimate-test-reporter": "0.0.3",
+    "coveralls": "^2.11.2",
     "istanbul": "^0.2.10",
     "jscs": "~1.6.2",
     "jshint": "^2.5.1",