[resteasy-dev] README.md update 3.1.0

[Rebecca Searls]

There is outdated information in the README.md.  The most egregious is the ref to
the wiki, http://wiki.jboss.org/wiki/RESTeasyJAXRS.   The URL no longer exists.
The new URL is https://developer.jboss.org/wiki/ResteasyWIKI, however the information
on this page is outdated.  The last update was 2013.  There are a couple of ways to
address this,
  1. Update the information on the wiki page.
  2. Replace the existing page with a new one;  The new page could link to the old page.
  3. Remove the reference to the wiki page from the README.

I recommend option 1 or 2

The other information to be updated is
  A. Ref the new location of the examples.
  B. JDK 1.8 is to be used.  ant scriptlets are no longer an issue
  C. Provide URL to the JDK 8 Cryptography Extension