g:vimrplugin_assign = 2 swap precedence of '_' and '<-'
bugfix: insert '_' after a rString or rSpecial
short circuit to behave same way as prev bugfix
cleanup to match master on if statement
Merge pull request #126 from pimentel/changeUnderscoreBehavior

let g:vimrplugin_assign = 2 swaps precedence of '_' and '<-'
vimrplugin_assign now accepts values 0, 1 and 2.
Note on problematic mappings.
bugfix for when inserting <- in the middle of line