Added the first unit tests.
Docblock improvements.
Issue #1848720 by cpliakas: Added API function for parsing terms and phrases from a passed search query, improved on the comments.
Issue #1847984 by cpliakas: Added API functions for getting and setting the proximity boost variable.
Cleaned uo unused variable.
Issue #1847978 by cpliakas: Fixed undefined variable and logic error when determining whether the query has phrases.
Added proximity term boost to bias settings.
Initial commit of the Apache Solr Term Proximity module.
