Update 'show collections' to report sizes

Reports collection sizes as compressed and uncompressed sizes of the current database.
Merge pull request #1102 from ankurcha/bugfixes/tokumx-1.4

Update 'show collections' to report sizes
made 'show collections' streaming #1102
Merge branch 'bugfixes/tokumx-1.4' into releases/tokumx-1.4