Profiling attempts
Merge branch 'master' into profiling
Merge branch 'master' into profiling
Merge branch 'master' into profiling
Merge branch 'master' into profiling
Merge branch 'master' into profiling
Profiling task
Returning the original test task
Merge pull request #157 from weshatheleopard/profiling

Profiling
Since the "data only" option does not provide much benefit in the object model, it will be deprecated soon.
Starting actual deprecation
Updating tests
Preparing for further deprecation
Merge branch 'master' into performance_enhancers

Conflicts:
	lib/rubyXL/worksheet.rb
	spec/lib/worksheet_spec.rb