add lineChart (2D) and show_marker to LineSeries (for 2D line chart)
fix loading LineChart
only yield if block given
fix line chart name
add test and remove activesupport methods
Added 2.0.0 to rubies for travis-ci
First run at 'hidden' comments WIP

The xml is genrated correcty, but the comment still shows until it is
selected once in the excel ui - so I must be missing something.
Merge pull request #178 from Programatica/master

Add LineChart
Fixed LineChart and refactored chart axes management
marking 1.8.7 as an allowed failure
Updated master branch travis-ci build stats badge

This should always point to master
Fixes link to straydogstudio github profile
Merge pull request #180 from nogara/fix-readme

Fixes link to straydogstudio github profile
Added support for specifying between/notBetween formula in an array.
Documentation for @formula attribute.
Merge pull request #183 from straydogstudio/master

Added support for specifying between/notBetween formula in an array.
Updated gemfile source and added ruby-prof
Updated profile to use ruby-prof as we are in 2.0 for dev these days.
Removed invalid usage comment from pprof days
Grouped profile tools