Merge pull request #40 from emorency/master

OPAL-1977: On variable update, allow to delete categories
Added the text (source) containing the invalid character to the exception required by the client
Merge pull request #41 from kazoompa/master

Added the text (source) containing the invalid character to the exception required by the client
IncrementableView refactored to IncrementalValueTable
MAGMA-244 date and datetime methods added
MAGMA-244 date and datetime methods moved to TextMethods
Check for value set availability
Fix value set timestamps caching issue
Upgrade to gradle 1.8
Refactor MongoDBDatasourceFactory
Add @Nullable
Use Obiba repo for gradle wrapper
Merge pull request #42 from obiba/project-database

Project database
Fix incremental build for Jenkins with gradle 1.8
Fix findbugs warnings
Fix findbugs warnings
Merged fixes from 1.7.x - remove SPSS and CSV specific exceptions, add new test cases for duplicate entities and overflow var values
Merge pull request #44 from kazoompa/master

Merged fixes from 1.7.x
getValueSetTimestamps added
Merge branch 'master' of https://github.com/obiba/magma