geo_ruby should be required in function resolver, where used

Existing tests cover this IF geo_ruby is not included in test_helper.rb.
Removing the require simulates applications that do not us geo_ruby elsewhere,
and thus having globally required that library.
Merge pull request #6 from joshcom/master

geo_ruby should be required in function resolver, where used
Bumped version v0.3.3
API-1887 months() and years() functions
Merge pull request #7 from sparkapi/API-1887

API-1887 months() and years() functions
version lock for georuby
Bumped version v0.3.4
API-1997 bnf documentation and generator tool