Add support for jpeg-recompress from danielgtaylor/jpeg-archive
Fix comments and ruby < 2.0 compatibility
Merge branch 'jpeg-recompress' of https://github.com/wjordan/image_optim into wjordan-jpeg-recompress

Conflicts:
	lib/image_optim/bin_resolver/bin.rb
temporary use image_optim_pack branch jpeg-archive
remove downloading of jpeg-recompress from travis, it will be provided by image_optim_pack
Merge branch 'worker-analysis' into wjordan-jpeg-recompress
compress from src to dst instead of copying src to dst and compressing inplace in jpegrecompress worker
build arguments using %W and use long argument names in jpegrecompress worker
use --no-copy argument in jpegrecompress worker
regenerate options for jpegrecompress worker in readme
set run_order of jpegrecompress to -5 (after jhead, before jpegoptim)
extract init_all from create_all in worker
add allow_lossy option to allow lossy workers and optimizations, needed for #65
use init to initialize jpegrecompress worker only if allow_lossy
conform indent in jpegrecompress worker
rename QUALITY_OPTIONS to QUALITY_NAMES in jpegrecompress worker
remove lossless quality in jpegrecompress worker
build quaility names description from QUALITY_NAMES in jpegrecompress worker
add handling of lossy only workers to "optimizes at least one test image" spec
add entries to changelog, readme and gemspec about jpeg-recompress and optional lossy compression, resolves #65