formatting
fixed TOC issue
break line on blackquote
fixed DocDecompressor
2.1.2
updated ChangeLog
multi-level ToC + fixed huffdic decompression issue
updated ChangeLog
fixed multiple CSS enries for same selector
fixed '0' value processing for lengths in CSS
extra paremeter book skipEmpty for ZLStringUtil::split()
'margin' property support
CSS changes description
2.1.3
updated ChangeLog
Merge branch 'master' into covers_sync