add an option for dbpath
create a class for revision
modify MethodData and ASTAnalyzser to use RevisionData instead of the number of revision
[BUG_FIX] a bug was fixed that sets wrong values into endRevisionId of MethodData
create a method to analyze given files
add options for username and password to access a given repository
implement a function to initialize repository with given option values
create a class to detect target revisions from the given repository
implement a function to detect target revisions within the specified range
[REFACTORING] move TargetRevisionDetector into the svn package
create a class to detect changed files in the specified commit