Update WebView.java

Checking for Case Sensitivity Issue of "HTML" vs "html" and "HTM" vs "htm"
Update RhoWebViewClient.java

During HyperLInk pressing handling of case sensitive issue
Update WebView.java

CHanges the code to convert to lowercase html
Update RhoWebViewClient.java

changed the code for lower case extension
Update WebView.java
Merge pull request #355 from rhomobile/BLR_SR_EMBPD00144304

Android: Change .HTML -> .html in URLs