[OLINGO-235] reader option to switch off validation of facets

Change-Id: Ie35a7b5ce4e72f0d21a546e35768a36718635f06

Signed-off-by: Stephan Klevenz <sklevenz@apache.org>
[OLINGO-235] code cleanup
[OLINGO-245] Fix for names of foreign key names. 
Properties representing foreign key are prefixed with FK


Signed-off-by: Chandan V A <chandan.v.a@sap.com>
[OLINGO-251] entity writer can serialize additional links

Change-Id: I84e4037eaad71baa96c82482c3b438e500b67f5e

Signed-off-by: Stephan Klevenz <sklevenz@apache.org>
[OLINGO-251] clean up code
[OLINGO-255] fixed
[OLINGO-256] Added more tests
[OLINGO-256] Added missing import
[OLINGO-243] Fixed wrong content type handling
[OLINGO-256] Changed batch write/read to be RFC1341 compliant
[OLINGO-256] Minor code clean up
remove incubator lable
[OLINGO-275] Fix for xml and verified for json
[OLINGO-275] Fix RAT issue