implemented tables
resolved issue with escaped pipes
corrected some omitted characters needing escape in _split_on_unescaped
added tolerance for up to three spaces for headers and first horizontal rule as per markdown extra
added some tests for tables
added reference to new tests
Fix broken escaping introduected in 404344f

`this` is the main markdown object, not the dialect inline itself.
Style change - move function just used in table processing into Maruku.block.table
Implement tables for Maruku dialect by redsun82

Closes #66
Update changelog since 0.4

I might have missed a few issues. Sorry :(
Add test for image without title inside link (#71)
v0.5.0
Start changes file for next release
Merge remote-tracking branch 'evilstreak/master' into upstream

* evilstreak/master:
  Start changes file for next release
  v0.5.0
  Add test for image without title inside link (#71)
  Update changelog since 0.4
  Style change - move function just used in table processing into Maruku.block.table
  Fix broken escaping introduected in 404344f
  added reference to new tests
  added some tests for tables
  added tolerance for up to three spaces for headers and first horizontal rule as per markdown extra
  corrected some omitted characters needing escape in _split_on_unescaped
  resolved issue with escaped pipes
  implemented tables
fix blank line handling within fenced code blocks