add --dark-quantile command-line parameter to rts2-image


git-svn-id: http://svn.code.sf.net/p/rts-2/code/trunk/rts-2@12114 65ab8f4e-f147-0410-b3a9-f14133ecfe55
Add .gitignore
add load average value into system sensord
added LIB_PTHREAD to httpd Makefile
Merge branch 'master' of github.com:RTS2/rts2