Add setting for allowing/preventing search to wrap around

[johnckendall]

Simple option to prevent search wraparound like the vi option: set nowrap and set wrap

[t9md]

Why did you change repository reference? I can not get your intention.
Also, I think your PR have following caveat.(not confirmed, just from code-read).

• When there is no match in forwarding direction, it return last match(it should return nothing).

Also I need test spec before merging this(this is depending on content of changes, I sometime accept test-less PR).

[johnckendall]

Sorry, new to this; first PR. I will look into creating a test spec.
About the repo reference; I thought I needed to do this to make sure I get my version locally? Still not sure how this stuff works I guess.
Regarding the last match behavior; I left it that way because I like the way it works! ;-) I suppose I could add another option switch to turn it off if you think it is needed.
(sorry for late reply, i've been on a cruise in the gulf for last 10 days)