Add missing import to crash course
Merge pull request #21 from hammer/patch-1

Add missing import to crash course
Merge remote branch 'origin/0.7.x'
- Build tool dependencies updated
	- Updated to Scala 2.11.1
	- Updated to ScalaTest 2.2.0
	- Updated to SBT 0.13.5
	- Updated to SBT Scalariform 1.3.0
	- Updated to SBT Unidoc 0.3.1
	- Updated to SBT PGP 0.8.3
- Runtime dependencies updated
	- Now dependent on Scala XML 1.0.2 (XML support was separated from standard Scala library)
	- Updated to Spray JSON 1.2.6
	- Updated to Avro 1.7.6
	- Updated to SLF4J 1.7.7
	- Updated to Logback 1.1.2
- Added AvroType subclasses for Java Boxed primitive types (java.lang.{Boolean,Byte,Character,Double,Float,Integer,Long,Short}) which are nullable
- Added AvroTypeIO subclasses for Java Boxed primitive types (java.lang.{Boolean,Byte,Character,Double,Float,Integer,Long,Short})
- Updated AvroMapIO to throw runtime errors if null keys are encountered
- AvroStringIO now writes a nullable union (Scala Strings are identical to java.lang.String and can store nulls)
- AvroXmlIO now writes a nullable union (scala.xml.Node can store nulls)
- Added tests for AvroByte, AvroChar, AvroShort
- Tests for Java boxed primitive type and IO classes