Fix compiler warnings
Use install(1) to install usblamp
Improve invocation of /usr/bin/usblamp
Merge pull request #10 from kpcyrd/safer-invocation

Improve invocation of /usr/bin/usblamp
Merge pull request #9 from kpcyrd/make-install

Use install(1) to install usblamp
Merge pull request #8 from kpcyrd/narrowing-conversion

Fix compiler warnings