[MINOR_CHANGE] remove unused import statements
implement a function to parse runtime arguments and load specified option values for MethodAnalyzer
create the main class of MethodAnalyzer (but it needs more implementations)
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