Feature/xticks rotate

[abkfenris]

Rotating the tick marker labels on the x-axis of the matplotlib plots to make things more ledgable.

Before:

After:

[codecov-io]

Current coverage is 81.75%

Merging #95 into develop will increase coverage by +0.04% as of 0d1f914

@@            develop     #95   diff @@
=======================================
  Files            32      32       
  Stmts           908     910     +2
  Branches          0       0       
  Methods           0       0       
=======================================
+ Hit             742     744     +2
  Partial           0       0       
  Missed          166     166       

Review entire Coverage Diff as of 0d1f914

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Uncovered Suggestions

1. +2.09% via app/api_0_1/gages.py#198...216
2. +1.32% via ...p/api_0_1/sensors.py#124...135
3. +1.21% via app/backup.py#17...27
4. See 7 more...

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