Added curl request, though it curls from dummy url
added option to specify version, calls install.m0rtardata.com
difference between prod and dev
added check for osx version, still need unit test though
added unit test to test version of machine, changed url to match location of shell script
Added message to update with version:upgrade if installed with omnibus
added function to check how gem is installed, modified version:upgrade to check method of installation and handle error occordingly
added check to updater to check if on mac, added error display message for curl request
chaned curl to use tmp dir
removed comments
removed commented out code
added sudo to curl command, changed how mortar gem is checked
got unit tests to pass
added explicit mocking for testing if running on a mac
Merge pull request #172 from mortardata/cngan_upgrade_command

[#65058818] upgrade command