Update README.md

Adding link to binary download page
Update README.md
Change for Java 1.7 fix. Includes:
- updated aspectJ refereence in droid-parent pom - now v1.7.2
- updated signature files
- corrections to character encoding in Help
- updated version references in Help FAQ and txt file.
- amended droid.sh file to remove Windows style line endings (which cause "Bad Interpreter" error on Linux/Mac OS X.
Change for Java 1.7 fix. Includes:- updated aspectJ refereence in droid-parent pom - now v1.7.2- updated signature files- corrections to character encoding in Help- updated version references in Help FAQ and txt file.- amended droid.sh file to remove Windows style line endings (which cause Bad Interpreter error on Linux/Mac OS X.
Correction to make first code line in droid.sh a comment, so we do not get the no such file mesaage when running on Mac OS X ad Linux.
Added Binary default signature type to Spring configuration files (fix for github bugs 2 and 12)
Updated tests which referred to the default signature files for the last release to refer instead to the new default signature files for this one.   Removed the previous default signature files.  Tests which refer to older signature file versions are unchanged.
Updated tests - for latest signature files
Re-added new signature file V68
Merge pull request #24 from snail1966/master

Changes for Java 7 compatibility, and updated default signature files.
[ignore] ignore compiled artifacts
[release-eng] preparing for 6.1.1 release
[maven-release-plugin] prepare release 6.1.1
[maven-release-plugin] prepare for next development iteration
Replaced version 65 signature file with version 68 in default location
Removed mistakenly added target file from git
[release-eng] preparing for (actual) 6.1.2 release
Repaired broken shebang line
[maven-release-plugin] prepare release droid-6.1.2
[maven-release-plugin] prepare for next development iteration