Addressing issue #3.
First cut at issue #5.
Address issue #2 by making each Span field clearly documented.
Merge branch 'issue3-tokenlist' into 'master'

Tokenlist changes - fix #3

@mthomas, see here for issue #3.

I'm willing to wait on merging to let @bvandurme and @charman comment further.
Update property struct with additional info. Close #5.
Fix an import error.
Merge branch 'properties' into 'master'

Implement Properties inside Argument [ issue #5 ]

An attempt to address the needed changes for the BinarySRL task.
Merge branch 'provspans' into 'master'

Provspans - Issue #2

@fferraro - is this satisfactory?