Added support for custom_forms & fix a bug

Bug fixed : line 54, wrong variable name
Support custom_forms, the structure of the message should now be :
  <Code Word>#
  <Decimal Degree Latitude>#
  <Decimal Degree Longitude>#
  <Title>#
  <Location>#
  <Event Description>#
  <Category Codes seperated by commas>#
  <form id>#
  <custom_fields (same order as defined)>
Where # is the delimiter
Only values of custom_fields are accepted, so you MUST sort your fields in the
message like you did in the form creator of Ushahidi.