install specific gem version
pass -v/--version to Gem::GemRunner
Merge pull request #55 from opscode/chefdk-46

fix gem -v/--version option behavior
Handle GemRunner returning nil on success
Merge pull request #57 from mpasternacki/bugfix/gem-exit

Handle GemRunner returning nil on success
Initial specification of policyfile builder
Update policyfile lock builder spec
Build a minimal policyfile with content hashing
Reorganize policyfile builder spec to use contexts
Add git profiling module to extract data from dev cookbooks
extract git cookbook test setup to shared context
Integrate git metadata discovery into lockfile generation
Add support for custom identifiers to lockfile builder
Add origin info to cached cookbooks; complex test case
verify cached cookbook exists when building policyfile lock
remove 'Exceptions' namespace
Error out if git test setup commands fail
set author when commiting to git repo test data
Configure committer for git test setup
Document cookbook attributes