Adding Travis CI and Coveralls support

pubspec.yaml

 name: dev_compiler
 description: Dart dev checker / compiler
 dependencies:
   analyzer:
     git:
-      url: git@github.com:dart-lang/ddc_analyzer.git
+      url: https://github.com/dart-lang/ddc_analyzer.git

[Siggi Cherem (dart-lang), 2015/03/17 15:03:50]

If this were to still require a password, another option we could do is to
automate this edit you have here, and do it in travis. For example, add a local
.gitconfig file to rewrite these or make it part of the travis script to change
it and call pub-get on it. Thoughts?

[kevmoo, 2015/03/17 15:14:38]

Now that this dependency is public, we shouldn't have a problem. This URL is
only used by pub, so the fact that it doesn't use SSH is not an issue – right?

[Siggi Cherem (dart-lang), 2015/03/17 15:18:07]

Let's try it, I think you are right. 

       ref: master
   args: ^0.12.1
   cli_util: ^0.0.1
   crypto: ^0.9.0
   dart_style:
     git:
-      url: git@github.com:dart-lang/dart_style.git
+      url: https://github.com/dart-lang/dart_style.git
       ref: master
   html5lib: ^0.12.0
   logging: ^0.9.2
   path: ^1.3.0
   shelf: ^0.6.0
   shelf_static: ^0.2.1
   source_maps: ^0.10.0
   source_span: ^1.0.0
   stack_trace: ^1.1.1
 dev_dependencies:
   pub_semver: ^1.1.0
   unittest: ^0.11.0
 dependency_overrides:
   analyzer:
     git:
-      url: git@github.com:dart-lang/ddc_analyzer.git
+      url: https://github.com/dart-lang/ddc_analyzer.git
       ref: master
 executables:
   # Similar to "analyzer.dart" and its command line "dartanalyzer", we use
   # "dartdevc" and "devc.dart"
   dartdevc: devc