Implement bidirectional t motion and fix exclusive & inclusive flag

Implement: bidirectional t including within line, two-key, multi find
motion.
Fix: misuse of exclusive -> inclusive
Fix: bidirectional find motion inclusive flag
Add: test case for bidirectional t motion

close #6
Update doc: add bidirectional t motion
Update doc: missing two-key motion table
Merge branch 'feature/bd-t' into master