Add SpaceBetweenAphabeticalWord
make ValidationError class immutable

setFileName / Sentence are left for dependencies from other classes
Merge pull request #229 from recruit-tech/make-ValidationError-immutable

make ValidationError class immutable
Merge branch 'space-with-alhabetical-word-validator' of https://github.com/takahi-i/redpen into takahi-i-space-with-alhabetical-word-validator
package migration
Merge branch 'takahi-i-space-with-alhabetical-word-validator'
Merge master