Fix buffering counter issue due to refactoring using Counter class
CLT-87 & CLT-88 support for item tables in the Android SDK

Changes:
  - CLT-87
    - added writeItem methods to buffer data destined to an item table.
      These APIs don't enforce the presence of the time column in a record
  - CLT-88
    - added DbTblDescr/DbItemTableDesc/DbLogTableDescr classes to descirbe
      a log and a item table respectively
    - using DbTblDescr everywhere in the AbstractTdLogger exect the public
      APIs
    - made DbTblDescr and derived class Parcelable to be able to be
      transferred through an intent
    - create hashCode and equals methods to use 'db#table' hashed as an
      integer number
    - using DbTblDescr as key in all BufferPacker maps
    - extended the post method in DefaultApiClient to accept additional
      parameters to be added in the body
      of the HTTP request