added heap memory chart and gc chart in JVM tab
fixed small chart issues:
fixed wrong build order in makefile
removed debugging output
added api for Memory Pools graph
added grpah box for memory pools
set minimum value of 0 to jvm graphs
rearranged boxes in jvm tab
fixed merge conflict with master branch
Added Cassandra API to build order before the CassandraGraph
Merge pull request #57 from dzautner/jvm-tab-charts

Jvm tab charts
Merge pull request #58 from dzautner/fix-makefile

Added Cassandra API to build order before the CassandraGraph
removed debugging output
added cassandra boxes to the build order
Merge pull request #59 from dzautner/fix-build-order

Fix build order