0.2.4

• Fix a minor bug in the algorithm
• Implement orphan synapse decay
• register python regions in Region class method
• moved registration of python regions to nupic.core
• date encoder bug fix
• Implement orphan synapse decay
• changed default regions to tuples
• fill predictedActiveCells with 0
• removing irrelevant files
• removing old network api demo 2
• modified PyRegion to accept custom classes
• renamed unionMode to computePredictedActiveCellIndices
• set the output size for active indices and predicted+active indices to max possible size
• converting union pooler input to right format
• Port AnomalyRegion serialization
• Rename "enc" to "encoder"