Add license header to source files
ACDC-7 Test for checking license information

This commit adds two tests, and an update to the LICENSE file.

The first test will enforce that each ruby and javascript file includes
a short header describing its license.

The second will search through all files looking for references to
copyright, GPL, etc.  There is a list of known occurrences of these terms
which is honored.
Merge branch 'dev' into license-checking

Conflicts:
	lib/new_relic/stats.rb
	test/multiverse/suites/sinatra/sinatra_test.rb
ACDC-7 Update license headers and test after merge from dev
ACDC-7 Skip auto-generated build.rb file in license validation
Merge remote-tracking branch 'origin/dev' into dev
ACDC-7 Fix license tests in rails 2.0 test environment
ACDC-7 missed an or
RUBY-1044 Fix mocha Ruby 2.0 incompatibility
ACDC-7 Also ignore ctags index file when checking for license issues
Run travis tests under Ruby 2.0.0 also