Added styles to layout.

	modified:   res/layout/activity_tellmetime_layout.xml
	modified:   res/values/styles.xml
Added autoscaling depending on screen size.

	modified:   res/layout/activity_tellmetime_layout.xml
	deleted:    res/values-large/dimens.xml
	deleted:    res/values-xlarge/dimens.xml
	deleted:    res/values/dimens.xml
	modified:   res/values/styles.xml
	modified:   src/info/tellmetime/TellmetimeActivity.java
Added class that caches application context, so it's available everywhere.

	modified:   AndroidManifest.xml
	new file:   src/info/tellmetime/TellmetimeApplication.java
Moved PanelsHider class to separate file

	new file:   src/info/tellmetime/PanelsHider.java
	modified:   src/info/tellmetime/TellmetimeActivity.java
Minor changes in comments

	modified:   src/info/tellmetime/TellmetimeActivity.java
Moved the clock algorithm to separate class.

Merged code from addHighlight() and removeHighlight() into one abstract function setColor().
Added scaling of shadows depending on screen size and density.

	new file:   src/info/tellmetime/Clock.java
	modified:   src/info/tellmetime/TellmetimeActivity.java