pinned dependency plugin version to 2.8 (in backend)
#61 added constructor in Execution that takes the current time as begin
using Timestamp instead of Date in database mapped classes
#61 store methods are no longer static
store methods are cascadable
setters return self to be cascadable
#61 updated usages of setters and store method
#61 writing Executions with reduced number of attributes
Merge branch 'master' into dev_results_db
#31, #32 added class diagram for algorithm interfaces
#61 added TestHelper.java to synchronously reset database in client tests
#61 in executeAlgorithms test reset database and store algorithm before execution
Merge remote-tracking branch 'origin/master' into dev_results_db

Conflicts:
	backend/src/main/java/de/uni_potsdam/hpi/metanome/algorithm_execution/AlgorithmExecutor.java
	backend/src/main/java/de/uni_potsdam/hpi/metanome/results_db/Algorithm.java
	backend/src/test/java/de/uni_potsdam/hpi/metanome/algorithm_execution/AlgorithmExecutorTest.java
	frontend/src/test/java/de/uni_potsdam/hpi/metanome/frontend/client/GwtTestBasePage.java
	frontend/src/test/java/de/uni_potsdam/hpi/metanome/frontend/client/GwtTestServiceCall.java
in AlgorithmExecutorTest.java calling ind algorithm with file input
in ConfigurationValueFileInputGenerator.java changing constructor parmameter from [] to ...
Merge pull request #146 from HPI-Information-Systems/dev_results_db

Refactoring of results db