Documentation update

Documentation update
changed the way rwsplit router test makefile calls subfolder makefiles
Merge remote-tracking branch 'maxscale/Z2' into rwsplit_hint_tests
removed unrelated files from the branch
Fix for Bug #466, http://bugs.skysql.com/show_bug.cgi?id=466
hintparser.c:hint_parser:when string token is found, create a copy of the token value instead of copying the its address because token will be freed before the value is used.
	hint_next_token:didn't recognize '=' as TOK_EQUAL, fixed that. Read the code.
hint.c:hint_create_parameter: copy the pointer to parameter name instead of creating copy of it - pname is already copied from token before the call
readwritesplit.c:routeQuery:Hint name was copied when hint value was supposed to be copied, thus resulting invalid value for hinted parameter. Also fixed server type in trace log command.
skygw_debug.h:Added string for Relay server to macro STRSRVSTATUS.
Merge branch 'Z2' of https://github.com/skysql/MaxScale
added tests for erroneous hint input
Merge remote-tracking branch 'maxscale/Z2' into rwsplit_hint_tests
Partial fix to Bug #470, http://bugs.skysql.com/show_bug.cgi?id=470.
hintparser.c:token_get_keyword: Handling for TOK_STRING was missing.
added output to tests in case the server didn't respond
Merge remote-tracking branch 'maxscale/Z2' into rwsplit_hint_tests