Merge pull request civisanalytics#288 from mheilman/prep-v1.9.4 bump version and update changelog for v1.9.4

MAINT increment to version 1.9.3 (civisanalytics#282) 

Merge pull request civisanalytics#275 from mheilman/prep_v1.9.2 bump version and update changelog for 1.9.2 release

Merge pull request civisanalytics#270 from civisanalytics/release-v-1… ….9.1 In Which We Create Release 1.9.1

MAINT Update version number to 1.9.0 (civisanalytics#251) 

MAINT Increase version to v1.8.1 (civisanalytics#218) Prepare for bugfix release.

MAINT Update version number to v1.8.0 (civisanalytics#213) 

MAINT Prepare for v1.7.2 bugfix release Update version number to 1.7.2 and add missing changelog entry for civisanalytics#195.

[CIVP-13534] Escaping in civis_to_csv has changed from v1.6.0 to v1.7… ….0 of the python client (civisanalytics#185) * remove use of parall-unload for civis_to_csv * update comment

MAINT Update version number to v1.7.0 (civisanalytics#181) Prepare for new minor release.