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.
Add support for preserving leading and trailing spaces in cell values
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
Excluded profile group when running on travis
Add benchmark for preserve space
Added colors to examples for charts

Colors are required by OpenOffice, and LibreOffice, and syntactically
correct regardless so we should be putting them in.
Added line specification

Required by Libre and Open office, and correct by spec. When we get a
requirement to customize the line width/shape this should be extracted
out into a Line class.
Added prep for 1.3.6 release
Moved simplecov dependency to Gemfile
Fixed comment visibility
Removed useless coding hint
Altered integerish test to use a Class

The validator will try to cast whatever it is fed to_i. Unfortunately
in 1.8.7 Symbol supports to_i.
Updated readme to correct release date.
Revert changes to cell serialization
Add a preserve_spaces option to worksheet, defaults to true