Remove the guard of autoload

The guard like this is unnecessary to autoload.
use \C, don't change 'ignorecase' option
Fix helptag
Fix a bug of operator-pending mode

"gg" is a linewise operation.
Add t feature
Update doc
Add repeat support
spec: simpler AddLine()
spec: Use :delete for clearing the buffer
Add tests for t and T
Improve for "."(repeat)

And, fix some problems.
Keep direction in repeat

If you start with "F", you back by "f".
Improve the move method in Visual mode
Add [count] support
Do not use "|"
Fix for special character like <CR>
Don't move by t when the next character is the target
Use "while" instead of "for"

For large count.
Merge pull request #2 from thinca/my-hack

色々改造