up symfony version to 2.6
change symfony version in travis
standardization code
Merge remote-tracking branch 'upstream/master' into up_symfony_to_2_6_version
code stardartization
Merge pull request #64 from tfe2012/up_symfony_to_2_6_version

up symfony version to 2.6
Merge remote-tracking branch 'upstream/master' into dot-fix-readme