Fix parsing of stats with sample rate

Also addresses error-reporting of same, which would incorrectly show the
sample rate when it was unable to recognise the stat type

Fixes #2
Add bounds checking on the stat line
Add program options to README
Additional readme tidying
Merge pull request #4 from benburry/documentation

Update README to include program options
Packaging updates

I've added dh-autoreconf as a build depend since without it nothing was
being built and the resulting deb package was empty.

 - add dh-autoreconf to Build-Depends
 - add --with autoreconf to debian/rules
 - Build-Depends of version >= 2.24.2 for libglib2.0-dev
Update changelog
Merge pull request #6 from davewongillies/master

Packaging updates
Merge remote-tracking branch 'benburry/samplerate-fix'