Added GML3 MimeType for fixing GEOS-6359
[Issue:227] Parameters not passed down when running GetFeatureInfo
Null checks on layer name when building conveyor
Merge pull request #280 from n-lagomarsini/gml3_1_5

Added GML3 MimeType for fixing GEOS-6359 (Backport on 1.5.x)
Merge pull request #281 from n-lagomarsini/issue227_1_5

[Issue:227] Parameters not passed down when running GetFeatureInfo (Backport on 1.5.x)