Merge pull request #5 from dejan-brkic/2.2.x

CRAFTER-547
CRAFTERCMS-555
Added parsing of date and html solr input fields for attachment indexing
CRAFTERCMS-555
Fixed bug with missing parsed date and html solr input fields for attachment indexing
CRAFTERCMS-556
Fixed wiping attachment content from solr index
CRAFTERCMS-556
Fixed bug with missing additional fields from attachment content type xml
CRAFTERCMS-557
Added support for multi value additional fields for attachment indexing
CRAFTERCMS-557
Fixed bugs in support for multi value additional fields for attachment indexing.
Merge pull request #9 from dejan-brkic/CRAFTERCMS-555

crafter search solr issues