conslidate many fields into ResponseCore2

open to renaming it to something else
Merge pull request #60 from natebrennand/sip

Sip endpoints finished - golint not run yet
Merge branch 'struct_consolidation' of https://github.com/natebrennand/twilio-go into struct_consolidation
renaming to ResourceInfo
Merge branch 'struct_consolidation' of https://github.com/natebrennand/twilio-go into struct_consolidation
consolidating into ResourceInfo
:volcano: make travis fail on golint errors :volcano:
fixing golint issues
Merge branch 'struct_consolidation' of https://github.com/natebrennand/twilio-go into struct_consolidation
Merge pull request #66 from natebrennand/struct_consolidation

Consolidate many fields into ResourceInfo
add tests for conference
add more tests for sms & media

44% => 81%
Merge pull request #68 from natebrennand/test_sms

Test sms
fixing golint issues
fixing merge conflicts
adding ip access control list endpoints