WKT: switch to camel case for easier reading of keyword made by combination of two words
(e.g. TIMEEXTENT -> TimeExtent, BASEGEODCRS -> BaseGeodCRS). Provide a KeywordCase enum
for letting the user choose his preference.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1568335 13f79535-47bb-0310-9956-ffa450edef68