rev15 of TA doc

uploaded at:
http://www.oasis-open.org/committees/download.php/36919/SCA_BPEL_Test_Assertions_15.odt
http://www.oasis-open.org/committees/download.php/36920/SCA_BPEL_Test_Assertions_15.pdf

This version of the TA doc should be in sync with the latest version of 
the spec (cd02-rev8). There are a few editorial things to fix up such as 
references, crossmapping table, assertion renumbering etc.

-Anish
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