Adds verbose logging

[flovilmart]

Improves logging in parse-server-push adapter

enable logging with VERBOSE=1 or VERBOSE_PARSE_SERVER_PUSH_ADAPTER=1

[codecov-io]

Current coverage is 86.97%

Merging #5 into master will decrease coverage by -0.81% as of 8cf938d

@@            master      #5   diff @@
======================================
  Files            5       5       
  Stmts          221     238    +17
  Branches        34      37     +3
  Methods          0       0       
======================================
+ Hit            194     207    +13
  Partial          1       1       
- Missed          26      30     +4

Review entire Coverage Diff as of 8cf938d

Powered by Codecov. Updated on successful CI builds.