Basically working, doesn't contain absolute paths for file and directory.
Remove whitespace in front of compiler commands.
Added feature tests for the JSON compilation database reporter.
Updated README with json-compilation-database.
Split up JSON db tests, moved magic number to constant.
Added spec for format_compile_command()
Use workaround for http://luan-itworld.blogspot.de/2013/08/ruby-undefined-method-for.html
Use json_pure on older rubies if available.
Added missing require json.
Install json_pure to make tests work for ruby 1.8.7
vendor JSON generator/parser for ruby 1.8

* Use json in stdlib for ruby 1.9+
* Change dashes in file names to underscores to match convention
Clean up files after feature runs
Simplify steps
Fix relative path loading
Merge pull request #77 from supermarin/json-db

Add Ruby 1.8-compatible JSON compilation database support