Reduce set of reserved characters in Elastic searches

Remove the hyphen and double quote from the list of reserved characters
in Elastic searches, allowing more effective searches for hyphenated
terms and quoted phrases.

Tox and django 1.11 support

Includes tox support to test on different Django versions and also added the support to Django 1.11

Release 1.0.1

Includes updated Elastic Search requirements, switching from Coveralls to CodeCov, and merging in some changes from the 0.1.x branch.

release-2015-09-11a: Merge PR #30 & Merge PR #31

• Allow elasticsearch to be configurable. EG use hosts and ports other than localhost:9200
• Make MockSearchEngine escape queries correctly

Version released to edx-platform

This includes latest mock-django library version which is used by tests.

release-2015-07-22: Merge pull request #28 from edx/dsego/SOL-1069-addendum

unicodefiy SOL-1069

release-2015-07-20: Merge pull request #27 from edx/dsego/SOL-1069

Add support for multi-value fields and filters to MockSearchEngine

release-2015-07-16: Merge pull request #26 from edx/dsego/SOL-731

Fix MockSearchEngine indexing to update documents in index, instead o…

release-2015-07-03: Merge pull request #25 from edx/dsego/SOL-958

Add feature flag to skip Enrollment_Start_Date filtering for course s…

Version Released to edx-platform.

Merge pull request #23 from edx/dsego/SOL-875

handle case when exclude_dictionary is empty