Began marker columns
Counting offset per line rather than repeating the process per marker
Merge branch 'master' of https://github.com/dart-lang/spark into umop-annotations-find_column
Fixed column calculation to be correct and removed testing with tooltips.
Removed code to check for column and replaced with ace.dart (Document).
Merge branch 'master' of https://github.com/dart-lang/spark into umop-annotations-find_column
Using ace to calculate row rather than using markers' (so wrapping works)
Merge branch 'master' of https://github.com/dart-lang/spark into umop-annotations-find_column
Merge pull request #885 from umop/umop-annotations-find_column

Annotations - find column from offset