Fixes for several issues

[Koed00]

• closes db connections on reincarnate
• task names can be overwritten with task_name argument
• allows blank Schedule names
• group name now works on schedules
• several dependency updates

[codecov-io]

Current coverage is 96.62%

Merging #152 into master will increase coverage by +0.01% as of b089484

@@            master    #152   diff @@
======================================
  Files           39      40     +1
  Stmts         2718    2724     +6
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit           2626    2632     +6
  Partial          0       0       
  Missed          92      92       

Review entire Coverage Diff as of b089484

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