BibUpload: recjson deletion

* Introduces new BibTasklet to update the recjson value after BibUpload
  runs over a series of records. (closes #1708)

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
4: I102 copyright year is outdated, expected 2014 but got 2012
28:28: E126 continuation line over-indented for hanging indent
71:18: E231 missing whitespace after ':'
142:16: E203 whitespace before ':'
144:17: E203 whitespace before ':'
145:23: E203 whitespace before ':'
146:23: E203 whitespace before ':'