Added docstring to svg_to_image
Merge branch 'feature/issue-13-create-tests-for-svg_to_image' into feature/issue-12-optional-file-size-optimization

Conflicts:
	mathml_to_image_service/svg_to_image.py
Added functionality to reduce image size and quality in svg_to_image
Fixed parameter error:
Merge branch 'master' into feature/issue-12-optional-file-size-optimization

Conflicts:
	mathml_to_image_service/svg_to_image.py
Added tests for quality parameter
Added quality setting to HTTP API
Updated docs
Added new package install to fix travis:
Merge branch 'master' into feature/issue-12-optional-file-size-optimization
Merge branch 'master' into feature/issue-12-optional-file-size-optimization

Conflicts:
	mathml_to_image_service/service.py
Merge branch 'master' into feature/issue-12-optional-file-size-optimization
Added quality parameter to merged test to make it pass
Merge branch 'master' into feature/issue-12-optional-file-size-optimization
Merge pull request #12 from rudigiesler/feature/issue-12-optional-file-size-optimization

implement optional file size optimization