default value for NCURSES_OPAQUE
fix conversion warnings
Use clock_gettime() when available and get rid of deprecated gettimeofday()

Conflicts:
	extconf.rb
Merge pull request #7 from gauteh/fix-implicit-conversion-on-clang

Default value for NCURSES_OPAQUE and fix conversion warnings on clang
Merge branch 'gauteh/use-clock-gettime-when-available'

Conflicts:
	extconf.rb
Remove redundant parentheses
Bump version to 1.3.1.1