Fixed issues with errorbar limits
Condensed setting values in lines_kw and plot_kw in the errorbar function
added errorbar limit test
added comments; fixed typo
removed extra space; pep8
fixes direction of arrowhead plot symbol for inverted x or y axes
updated api_changes and whats_new
removed rebase marker in test_axes
Merge pull request #2452 from larrybradley/limitfix

Fixed issues with errorbar limits