#173 added checks for null and blank values
Unit Test

com.rultor.base.Concat
Merge pull request #202 from krzyk/173

#173 added checks for null and blank values
bootstrap 3.0.0
Issue #184 Code Review Comment Fixes And Formatting Issue Fix
front page doc
disabled face rendering in unit.xsl
head() renders breadcrumbs in AclRs and UnitRs
layout fixed for bootstrap 3.0.0
Added More Assert statement
explanation texts added to all pages
layout improved
show zero dollars correctly
Merge branch 'master' of github.com:rultor/rultor
#155 sending messages in the background
#177 added GetterOf and ToStringOf
#177 GetterOf handles all objects
#177 added toString
#206: Unit renamed to Rule, Units renamed to Rules
#206: Work#unit() renamed to Work#rule()