Properly clean up XML errors in processBody

After processing XML errors, processBody does not properly clean the libxml error buffer.  This may cause unexpected errors if libxml is used later and or by another application.
Merge pull request #20 from gfrenoy/master

Properly clean up XML errors in processBody
added support for multipart data parameters
Merge pull request #27 from mayconbordin/master

Added support for multipart data
Merge branch 'upstream'
Fix php warning
changelog update