Auto-rewrite JSDuck-style #!/guide/ links.

This way the links to guides in jsduck will keep on working in guider.
Remove puts statement forgotten in for debugging.
Refactor use of String#gsub! in InlineTags.
Make @link work for linking to class members.

The links have to be fully qualified.  That is, the following will work:

    {@link Foo#method-bar}

While the following will NOT:

    {@link Foo#bar}

Related issue: #2
Print out warning when ambigous @link to member.

Default ambiguous member links to method.

Created a Logger class and added --warnings option.