Merge pull request #24 from pamval/master

CDA 63 and 64
[CDA-18] If a MDX queryreturns less columns than expected the CDA is unable to correctly handle the query thru the <Output/> tag.
Merge pull request #25 from jvelasques/master

[CDA-18] If a MDX queryreturns less columns than expected the CDA is una...
[CDA-23] Strange format in xls output in certain circumstances
Merge pull request #26 from jvelasques/master

[CDA-23] Strange format in xls output in certain circumstances
[CDA-67]re-fix exception handling (parent exception) and add according test case
[CDA-68] - Added check for null response when setting headers