Merge pull request #1 from behanceops/feature-abstraction

Feature abstraction
fix: Testing attribute loading @savegame
chg: renamed common.rb to default.rb due to higher precedence in chef, commented out include_attributes  @chg
chg: changed url and sha256sum values for both jamm 0.2.5 and 0.2.6 @chg
feature: chefspec tests for cassandra cookbook. 55% coverage @feature
feature: chefspec tests for dsc21 on centos 6.4. 67.65% coverage @feature
style: deleted version and tarball attributes @style
Merge pull request #2 from behanceops/feature-attribute-fixes

Feature attribute fixes
Merge pull request #124 from behanceops/master

Feature attribute fixes