README updated. Signature check disabled in the testing data.

README.md: Simple HowTo description added.

.hgignore converted to .gitignore.

Compare version IDs as strings instead of integers.

Temp files moved to /tmp, rootfs_unlock called after compatibility test.

We want to remount the root file system only in case we really need to write
to it, i.e. we must already know that the update is valid and compatible.

Merge

eupdate: Remove the old destination file before copying the new one.

Replacing a file which is currently being executed causes cp to fail
with message "cannot create regular file ...: text file busy". Removing the old
file before copying is a simple workaround.

See http://www.linuxquestions.org/questions/linux-general-1/cannot-create-regular-file-text-file-busy-731644/

Version number increased.

manifest: Initial version marked as "000", applicable versions commen…

…ted out.

This is to allow the file to be directly used as the initial manifest of an app.

Enabling tools to be executed from any system path.