publish 'build.version' and 'build.version.formal'

See http://confluence.jetbrains.com/display/TCD7/Build+Script+Interaction+with+TeamCity#BuildScriptInteractionwithTeamCity-AddingorChangingaBuildParameter
#to_datetime doesn't exist unless require 'time'

See http://devblog.avdi.org/2009/10/25/iso8601-dates-in-ruby/

This adds #to_datetime
Merge pull request #104 from Albacore/feature/ext-tc-version

publish 'build.version' and 'build.version.formal'
Paths now global module, fixes #106
v2.0.0-rc10
testing parameters are passed to command
testing the order of which parameters are passed
v2.0.0-rc11 - fixes #108
testing from TestRunner.Config
fixes #102 and fixes #109
Merge branch 'bug/109-stripping-prefix'
removing RSpec3 warning, this is equivalent
v2.0.0-rc12
Added missing syntax highlighting to readme.md
Merge pull request #112 from cH40z-Lord/patch-1

Added missing syntax highlighting to readme.md
documenting #list_spec
fixes #105
docs
v2.0.0-rc13
Merge branch 'master' into feature/fpm-packaging

FPM-packaging is a longer-running branch.