implement abstract setEntityManager
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# Changes to be committed:
#	modified:   pom.xml
#	new file:   src/main/java/cz/muni/fi/pv243/powerconsumption/service/StartupBean.java
#	new file:   src/main/java/cz/muni/fi/pv243/view/InvoiceBean.java
#	new file:   src/main/java/cz/muni/fi/pv243/view/LeaseBean.java
#	new file:   src/main/java/cz/muni/fi/pv243/view/OccupantBean.java
#	new file:   src/main/java/cz/muni/fi/pv243/view/ViewUtils.java
#	modified:   src/main/resources/META-INF/persistence.xml
#	new file:   src/main/webapp/WEB-INF/beans.xml
#	new file:   src/main/webapp/WEB-INF/classes/META-INF/forge.taglib.xml
#	new file:   src/main/webapp/WEB-INF/faces-config.xml
#	new file:   src/main/webapp/WEB-INF/web.xml
#	new file:   src/main/webapp/error.xhtml
#	new file:   src/main/webapp/index.html
#	new file:   src/main/webapp/index.xhtml
#	new file:   src/main/webapp/invoice/create.xhtml
#	new file:   src/main/webapp/invoice/search.xhtml
#	new file:   src/main/webapp/invoice/view.xhtml
#	new file:   src/main/webapp/lease/create.xhtml
#	new file:   src/main/webapp/lease/search.xhtml
#	new file:   src/main/webapp/lease/view.xhtml
#	new file:   src/main/webapp/occupant/create.xhtml
#	new file:   src/main/webapp/occupant/search.xhtml
#	new file:   src/main/webapp/occupant/view.xhtml
#	new file:   src/main/webapp/resources/add.png
#	new file:   src/main/webapp/resources/bootstrap.css
#	new file:   src/main/webapp/resources/false.png
#	new file:   src/main/webapp/resources/favicon.ico
#	new file:   src/main/webapp/resources/forge-logo.png
#	new file:   src/main/webapp/resources/forge-style.css
#	new file:   src/main/webapp/resources/jboss-community.png
#	new file:   src/main/webapp/resources/remove.png
#	new file:   src/main/webapp/resources/scaffold/pageTemplate.xhtml
#	new file:   src/main/webapp/resources/scaffold/paginator.xhtml
#	new file:   src/main/webapp/resources/search.png
#	new file:   src/main/webapp/resources/true.png
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# Untracked files:
#	.forge_settings
#	.idea/
#	power-consumption.iml
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