Update README.md

Adding link to binary download page
Update README.md
Added Binary default signature type to Spring configuration files (fix for github bugs 2 and 12)
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
Added ChangeLog
Workaround for startup bug: freeze db during copying instead of full shutdown. NB no new test included in this commit
Renamed 'upload' for signature files to 'install' throughout (github issue #14)
Modified ProfileSpecToXmlPersistenceTest to force comparison of values
in local time (and set test date to July so not GMT even in UK)
Enabling ProfileManager and disabling SignatureManager tests; correcting typos
in tests
Enabling/disabling tests