Added Sqlalchemy param bindings

[mlorenzana]

Added conversions for Date, Timestamp and Decimal

[codecov-io]

Codecov Report

Merging #133 into master will increase coverage by 0.6%. The diff coverage is 30.76%.

@@            Coverage Diff            @@
##           master     #133     +/-   ##
=========================================
+ Coverage   89.49%   90.09%   +0.6%     
=========================================
  Files          15       15             
  Lines        1608     1565     -43     
  Branches      190      181      -9     
=========================================
- Hits         1439     1410     -29     
+ Misses        131      117     -14     
  Partials       38       38

Impacted Files	Coverage Δ
pyhive/sqlalchemy_hive.py	90.19% <30.76%> (-0.91%)	:arrow_down:
pyhive/tests/test_hive.py	96.59% <0%> (-0.74%)	:arrow_down:
pyhive/presto.py	93.38% <0%> (-0.28%)	:arrow_down:
pyhive/tests/sqlalchemy_test_case.py	100% <0%> (ø)	:arrow_up:
pyhive/tests/test_presto.py	100% <0%> (ø)	:arrow_up:
pyhive/hive.py	90.59% <0%> (+0.49%)	:arrow_up:
pyhive/common.py	96.09% <0%> (+1.56%)	:arrow_up:
pyhive/tests/test_sqlalchemy_hive.py	100% <0%> (+1.83%)	:arrow_up:
pyhive/sqlalchemy_backports.py	48.55% <0%> (+2.89%)	:arrow_up:
pyhive/sqlalchemy_presto.py	92.36% <0%> (+3.05%)	:arrow_up:
... and 2 more

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[mlorenzana]

Any chance at a review? This adds functionality for using selectables with python datetime, date and decimal types.

[jingw]

Sorry, haven't forgotten about this. Will take a look next week.

[tooptoop4]

gentle ping @mlorenzana @jingw

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