Added javadocs for HaskellFile methods.
Added javadocs for HaskellFile methods.

charleso/intellij-haskforce,carymrobbins/intellij-haskforce,KasperJanssens/intellij-haskforce,begray/intellij-haskforce,KasperJanssens/intellij-haskforce,charleso/intellij-haskforce,carymrobbins/intellij-haskforce,begray/intellij-haskforce,charleso/intellij-haskforce,carymrobbins/intellij-haskforce,begray/intellij-haskforce