DS-1854

#### Not sure why there are so many files; changes should be only in the REST module, rest.cfg and item.java ####

Various improvements to the REST API 

* In the reply to queries (except for queries for single items/collections/communities) part of the returned data is a meta data block like: 
<context>
  <limit>100</limit>
  <offset>0</offset>
  <query>http://localhost:8080/rest/items/search?author=burke&expand=metadata&title="Synagogue sanctuary"</query>
  <query_date>2014-01-07T15:40:13</query_date>
  <total_count>2</total_count>
</context>

* User can query a list of itmes with optional parameters limit and offset /rest/items?limit=10&offset=100 

* Configuration setting (rest.cfg) for largest possible pagination limit to avoid memory problems on server # max pagination count 
max_pagination = 100 

* items search using discovery with configurable (rest.cfg) search and sorting terms
/rest/items/search?author=burke&order_asc=title 
with the configuration: 
item.search.author = author 
item.sort.title = dc.title_sort 
which maps user search terms to Solr 
/rest/items/search?q=skinning+megan 
works too but using discovery rather than Lucene 

* which search implementation is to be used can be configured (rest.cfg) 
implementing.search.class = org.dspace.rest.search.SolrSearch 
currently the user can chose between Lucene and Solr (Discovery)