Fix KDE themes

lsb_release can handle GoboLinux properly, it seems. So the fallback
detection can be used if lsb_release fails.

For themes with underscores in the name, only the last part was
displayed. #766

Aurorae themes were detected as kwin.aurorae because the name was
taken from library= instead of theme= in kwinrc. #766

Partial fix for #766

Misc: Add back Makefile

From bash(1):
> Constants with a leading 0 are interpreted as octal numbers. A
> leading 0x or 0X denote hexadecimal.

This causes error in uptime calculation.

Misc: Removed Makefile and added install script

config: Add .conf extensionn, remove shebang.

Fixes #760