parent and child table functions begun

functions implemented and commented : get , exists_not , add       ////
need to do : delete
updated my gitignore
added hard link to jars
Merge remote-tracking branch 'origin/master'

Conflicts:
	Comp4321_Yeung_Cheng_Julie/.classpath
	Comp4321_Yeung_Cheng_Julie/bin/Crawler.class