Added timezone support for date-string formats.

[j256]

Thanks to juur. Fixes #167.

[codecov[bot]]

Codecov Report

Merging #237 (d5385e4) into master (bac49c9) will increase coverage by 0.00%. The diff coverage is 94.11%.

@@            Coverage Diff            @@
##             master     #237   +/-   ##
=========================================
  Coverage     88.09%   88.10%           
- Complexity     2618     2621    +3     
=========================================
  Files           136      136           
  Lines          7199     7213   +14     
  Branches        944      947    +3     
=========================================
+ Hits           6342     6355   +13     
  Misses          561      561           
- Partials        296      297    +1     

Impacted Files	Coverage Δ
...a/com/j256/ormlite/field/types/DateStringType.java	94.44% <88.88%> (-1.99%)	:arrow_down:
...56/ormlite/field/types/DateStringFormatConfig.java	100.00% <100.00%> (ø)

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[j256]

How's this @juur? Does it go far enough? Are there other database types that need to support it?