Fixing ConcurrentModificationException when deleting valueTables
Merge pull request #52 from emorency/master

Fixing ConcurrentModificationException when deleting valueTables
OPAL-2067: Reverting to previous version of drop()
Merge pull request #53 from emorency/master

OPAL-2067: Reverting to previous version of drop()
Rename method to follow class pattern
Upgrade commons-math
Refactor for easier lisibility
Remove deprecated dependency
Use Stopwatch instead of TimedExecution
Fix failing test
Fix PMD warnings
Fix PMD warnings
Fix PMD warnings
Use Java 7 and migrate code.
Fix warnings
Try to add Cobertura
Fix PMD warnings