update Scala version, remove scala-parser-combinators dependency

Scala2.10.0 does not work with Java8. we should update Scala version

https://travis-ci.org/tototoshi/scala-csv/jobs/40079622#L221

```
[info] 'compiler-interface' not yet compiled for Scala 2.10.0. Compiling...
error: error while loading CharSequence, class file '/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar(java/lang/CharSequence.class)' is broken
(class java.lang.RuntimeException/bad constant pool tag 18 at byte 10)
error: error while loading Comparator, class file '/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar(java/util/Comparator.class)' is broken
(class java.lang.RuntimeException/bad constant pool tag 18 at byte 20)
error: error while loading AnnotatedElement, class file '/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar(java/lang/reflect/AnnotatedElement.class)' is broken
(class java.lang.RuntimeException/bad constant pool tag 18 at byte 76)
error: error while loading Arrays, class file '/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar(java/util/Arrays.class)' is broken
(class java.lang.RuntimeException/bad constant pool tag 18 at byte 765)
/tmp/sbt_9b5b5377/xsbt/ExtractAPI.scala:395: error: java.util.Comparator does not take type parameters
	private[this] val sortClasses = new Comparator[Symbol] {
                                            ^
5 errors found
[error] (compile:compile) Error compiling sbt component 'compiler-interface'
```