changed getRowAndCol from returning an array to returning an object; readability improvements
added a function called getLastColumnIndex
used getLastColumnIndex
added getLastColumnIndices method
using getLastColumnIndices method
added a getRowColumnIndices method
used the getRowColumnIndices method
added setSelectionRangeIndices method
used setSelectionRangeIndices method
changed the location of clearing the breakpoints
removed the now-unused global variable $scope.lastColumnIndices
readability of breakpoint row line
Merge pull request #22 from jgpettibone/master

migrated ace utility functions to ace.js; cleaned up app.js