Devel

Changes in this commit:

* Remove xpath predicating from the batch process mechanism
  * Resolves issue #40 
  * Extra performance improvements
* Changed batch input validation to ignore case in the input XML documents, since the oBIX specification does not highlight case sensitivity; providing the wrong case on an oBIX:BatchIn contract will cause the server to fail, for example providing  `<list is="obix:batchin" />` will cause the batch to fail validation whereas `<list is="obix:BatchIn" />` will succeed
* `sys/types.h` include removed from `obix_utils.h`, it's an empty import and is not actually used.  May have to investigate whether it's a requirement for RHEL