Merge pull request #52 from emorency/master

Fixing ConcurrentModificationException when deleting valueTables
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
MAGMA-247 - added condition to prevent creating null-value attributes
Merge pull request #55 from kazoompa/master

MAGMA-247 - added condition to prevent creating null-value attributes
Made sure a View with no variable does not extract valueSets from the source table
Merge pull request #56 from kazoompa/master

Bug Fix - View with no dictionary should not have values
Entities indexing fixed (ignore headers using fromRow property)