Modernize configure.ac

- Update AC_INIT and AM_INIT_AUTOMAKE as per [1]
- Update AC_OUTPUT as per [2]

[1]: http://www.gnu.org/software/automake/manual/html_node/Public-Macros.html
[2]: http://www.gnu.org/software/autoconf/manual/html_node/Obsolete-Macros.html
Bump for 0.5
Set transient hint in notifications

Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=738887
Merge pull request #53 from smcv/debbug-738887

Set transient hint in notifications
Fallback to filename in case no title

ncmpc, mpc both show the file's name when track has no title set.
Merge pull request #54 from pritambaral/patch-1
Make generated 'mpDris2' file executable