Merge pull request #135 from NickStefan/master

added unit test browser specrunner for workbook
Try gridifying before taking snapshot
Merge pull request #136 from johnheroy/take-snapshot-xlsx

Try gridifying before taking snapshot
Working snapshots after importing .xlsx
Merge pull request #137 from johnheroy/take-snapshot-xlsx

Working snapshots after importing .xlsx
Merge pull request #138 from fsbatista/angular

Merging  John's Branch
cells now only have '=' if actually formula