Merge pull request #1 from willmclaren/master

Support Structural Variants on VEP endpoint
Alter workings of archive endpoint to expect multiple results. GET method working, POST method untested.
[ENSCORESW-827] REST server left behind when changes were made to ens-core. Changes made primarily for GFF3 support
ENSCORESW-916: if no gene returned, symbol is not valid
Stop archive endpoint needing a URL argument, and get message body properly from POST.
Examples pointed to newer path instead of deprecated one.
High level documentation changes for the feature endpoints.
More fine grained feature documentation update.
Info related documentation about for the assembly endpoints.
Documentation update for the info related endpoints.
Documentation update for the sequence-based endpoints.
Improved readability.
documentation update for compara, mapping and variation endpoints
Update compara.conf
Ontology descendant spelling corrected in code and documentation. Other docs updated.
More comprehensible, less Ensembl specific jargon.
GFF3 output is not possible for the Archive endpoint
text/plain should be declared in the list of content-types
Fixed some closing tags to match the opening ones
Do not use xml when we mean phyloxml