Initial support for teamcity feature branches

Only builds from default branch are taken into account.
Please see description of feature branches ion TC wiki: http://confluence.jetbrains.net/display/TCD7/Working+with+Feature+Branches

Full support would require to track each branch separately in radiator, having individual green/red light and progress bar for each branch. 
I have no idea how to implement it in current visual design of ci-eye, unfortunately.