#5 Create a memmory as a Map for builds
#5 use new memory class in portlet
#5 Create a getter method so that memory can be references from outside
#5 Schedule a cache removal, configurable by properties
#5 Put the result and then return, instead of doing everything in one
sentence

Conflicts:

	docroot/WEB-INF/src/com/liferay/ci/jenkins/cache/LiferayJenkinsBuildCache.java
#2 Use same color for markers as for series (legend will be changed too)
Use Boolean instead of basic type
#2 Build json markers in a utility class
SF: move import to init.jsp
Remove confusing message in view.jsp: it's duplicated
#4 Create a view mode for default configuration: series-view-mode
#4 Backend: support retrieving status from last build
#4 Controlloer: support retrieving status from last build
#4 Create a view mode for lights-view-mode: it will display a red/green image depending on build's status