Parse 'for <n> days'
Parse 'for <n> days starting <relative date>'

Like
- for 3 days starting yesterday
- for 5 days starting today
- for 5 days starting tomorrow
- for 7 days starting next monday
- for 8 days starting in 5 weeks
- for 8 days starting first saturday in april
Merge branch 'master' of github.com:platzhaltr/datr.scala

* 'master' of github.com:platzhaltr/datr.scala:
  Parse 'for <n> days'

Conflicts:
	README.md
	TODO.md
	src/main/scala/com/acme/CommandLineInterface.scala
	src/main/scala/com/acme/Event.scala
	src/test/scala/com/acme/DateParserSpec.scala
	src/test/scala/com/acme/EventSpec.scala