clarifiying areaBetweens arg expectation, & how to use the  function with it
removing a trailing space
Merge pull request #899 from gwaldo/clarify_areaBetween

clarifiying areaBetweens arg expectation, & how to use the group function with it
initial version of 0.9.13 release notes, refs #893
Merge pull request #901 from obfuscurity/0_9_13_release_notes

Initial version of 0.9.13 release notes
missing backticks
Merge pull request #904 from obfuscurity/port_missing_backticks

Port missing backticks to master
0.9.13 release note markdown to rST syntax fix
mention #89
Merge pull request #905 from obfuscurity/mention_pr89

Mention #89 in release notes
typo
Merge pull request #907 from obfuscurity/pickle_typo

Typo for release notes