log: clean old files

Conflicts:
	elnetw-core/src/main/java/jp/syuriken/snsw/twclient/TwitterClientMain.java
ImageCacher: move cleaning old cache into TwitterClientMain
InitDepChecker: support poststart phase
pom.xml: javadoc report is quiet
pom.xml: sign jar
maven: Bump dependencies and plugins

remove redundant dependencies
add package.sh
package.sh: remove check dirty state in enter sandbox
package.sh: wrong * wildcard
pom.xml: sign for assembly jar
package.sh: add --force
package.sh: short arg
update changelog
package.sh: check changelog
package.sh: more verbose
package.sh: check existing tag
package.sh: rename package file
CProp: add #getTime
CProp: remove caching algorithm

Who are helped by this feature? Cache in yourself!!
package.sh: tag+count-rev