Merge branch 'master' of github.com:ingewortel/celltrackR

updated DESCRIPTION and NEWS to document the new changes

Merge pull request #1 from jtextor/cranversion

Version that can be submitted to CRAN

Added a count.subtracks option to the aggregate.tracks() function, so…

… that a column can be added to the dataframe with number of subtracks the estimate was based on. This will be version v0.0.1.

fixed typo in README and cheatsheet.