BF: removed deprecated .rvmrc in favour of .ruby-version and .ruby-gemset
BF: use JS cust$om variable value if set and data-tracking-value doesn't exist (resolves #17), swapped prop1 with prop12 (resolves #18), and version bump for a RC
Merge pull request #19 from bjfletcher/master

Use JS custom variable value, swapped prop1 and prop12, version bump for a RC