update Twitter Bootstrap V.3.0.0
Update application.css
Add basic test setup with an empty test
Using RbConfig for more precise output of OS
Complete test for os module
Get rid of unused mock_app method
Make slim template concat TODO a TODO again
Merge pull request #1419 from matthias-guenther/performance-tests

Performance tests
Use symbol instead of block if available.
Fix indentation for protected methods.
Fix mistakes in padrino-core/README.rdoc. [ci skip]
Merge pull request #1383 from WaYdotNET/twb_v3

update Twitter Bootstrap V.3.0.0
Update 0.11.4 release notes
Add final attribution to changelog
Update dependency to tilt 1.4.1