Improve ServiceData class to allow to encrypt some fields

[zaibon]

fixes #64

[codecov-io]

Codecov Report

Merging #65 into master will decrease coverage by <1%. The diff coverage is 85%.

@@          Coverage Diff          @@
##           master    #65   +/-   ##
=====================================
- Coverage      70%    69%   -1%     
=====================================
  Files         158    159    +1     
  Lines        6788   6855   +67     
=====================================
+ Hits         4781   4795   +14     
- Misses       2007   2060   +53

Impacted Files	Coverage Δ
zerorobot/server/handlers/views.py	100% <100%> (ø)	:arrow_up:
zerorobot/template/base.py	93% <100%> (-2%)	:arrow_down:
tests/test_service_data.py	100% <100%> (ø)
zerorobot/template/data.py	95% <100%> (+3%)	:arrow_up:
tests/test_god_mode.py	52% <41%> (-2%)	:arrow_down:
tests/test_service_template.py	51% <50%> (ø)	:arrow_up:
tests/test_task.py	85% <0%> (-9%)	:arrow_down:
zerorobot/dsl/ZeroRobotManager.py	84% <0%> (-8%)	:arrow_down:
tests/test_zrobot_api.py	79% <0%> (-7%)	:arrow_down:
zerorobot/server/handlers/createServiceHandler.py	72% <0%> (-6%)	:arrow_down:
... and 10 more

---

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[codecov-io]

Codecov Report

Merging #65 into master will decrease coverage by 4%. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #65     +/-   ##
=======================================
- Coverage      70%    65%     -5%     
=======================================
  Files         158    129     -29     
  Lines        6788   4943   -1845     
=======================================
- Hits         4781   3259   -1522     
+ Misses       2007   1684    -323

Impacted Files	Coverage Δ
zerorobot/server/handlers/views.py	100% <100%> (ø)	:arrow_up:
zerorobot/template/base.py	94% <100%> (-1%)	:arrow_down:
zerorobot/template/data.py	95% <100%> (+3%)	:arrow_up:
zerorobot/dsl/ZeroRobotManager.py	88% <0%> (-4%)	:arrow_down:
zerorobot/task/task_list.py	90% <0%> (-3%)	:arrow_down:
zerorobot/task/task.py	93% <0%> (ø)	:arrow_up:
tests/test_greenlets_mgr.py
tests/test_decorator.py
tests/test_task.py
... and 27 more

---

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Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update fc64f3e...91467a4. Read the comment docs.