added functionality to correct_NA to coerce factors to numeric/character
cleaned up comments
suppressing warning messages
added custom_NAs correction to correct_NA function
Updated syntax highlighting in README
Merge pull request #24 from ropensci/readme-edit

Updated syntax highlighting in README
Added Travis integration
added error message if data has no NA aliases
Merge pull request #25 from ropensci/travis

Added Travis integration
merging
merging
changed wording of messaging
changed name to naming convention
changed name to naming convention
changed name to naming convention
changed to new naming convention (test and fix)
Fixed lat/long check
Removed small tpyo
added example to fix_NA documentation
fix_date_continuity function added