Added LoggerFactory.setLogFactory() for other log impls, added NullLog

[j256]

No description provided.

[codecov]

Codecov Report

Merging #195 (ea950bf) into master (f6555f1) will increase coverage by 0.01%.
The diff coverage is 73.68%.

@@             Coverage Diff              @@
##             master     #195      +/-   ##
============================================
+ Coverage     87.40%   87.41%   +0.01%     
- Complexity     2516     2522       +6     
============================================
  Files           129      130       +1     
  Lines          7083     7098      +15     
  Branches        930      930              
============================================
+ Hits           6191     6205      +14     
- Misses          582      584       +2     
+ Partials        310      309       -1     

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/j256/ormlite/logger/LocalLog.java	92.30% <0.00%> (-2.08%)	21.00 <0.00> (ø)
src/main/java/com/j256/ormlite/logger/Logger.java	97.93% <0.00%> (-0.51%)	91.00 <0.00> (ø)
...in/java/com/j256/ormlite/logger/LoggerFactory.java	86.44% <77.77%> (+4.95%)	9.00 <3.00> (+2.00)
src/main/java/com/j256/ormlite/logger/NullLog.java	100.00% <100.00%> (ø)	4.00 <4.00> (?)

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