adding flag to set max heap size for forked javac processes, with a d…

…efault value of 256m

git-svn-id: http://svn.osgeo.org/geotools/tags/2.7.4@38445 e5c1c795-43da-0310-a71f-fac65c449510

updated README for 2.7.4

git-svn-id: http://svn.osgeo.org/geotools/tags/2.7.4@38444 e5c1c795-43da-0310-a71f-fac65c449510

comment out geogit; which pulls in 8-SNAPSHOTs

git-svn-id: http://svn.osgeo.org/geotools/tags/8.0-M4@38410 e5c1c795-43da-0310-a71f-fac65c449510