DS-1823 move dspace.url to build.properties

dspace.url is now independent from baseUrl
add context to  two methods parameters  to have monthly statistics localised
DS-1596 fix for Mirage Theme only.
DS-1596 fix for "Reference" theme
DS-1596 fix for "Classic" theme
DS-1596 fix for "Kubrick" theme
Fix DS-1596 for 'template' theme.
DS-1596 fix for "mobile" theme
Added a / in the path for the Go Home Button

The link being generated was for the current page, and not the home page.
Merge pull request #2 from misilot/patch-5

Added a / in the context path for the Go Home Button
DS-2082: do not pollute provenance when adding several bitstreams
DS-2097 : Request copy w/ dc.title qualified term

https://jira.duraspace.org/browse/DS-2097 
Enable the Request Copy function for items without dc.title (unqualified dc term) but with dc.title.anything (qualified dc term)
Update SendItemRequestAction.java
DS-1858 : Added key to 'Browse Items by:' of navbar in messages.properties
Switch some classes to HttpComponents
Some more httpclient fixes
Last httpcomponents conversion
[DS-1577] Harmonize with DS-2091, catch missing dependency on httpcore.
First pass at a third-party plugins directory
Factor the loader out of PluginManager, and provide a minimal unit test.