Add Skip & SkipLast Filter

[pocket7878]

Add Skip & SkipLast Filter

I'm using channel to buffering items in SkipLast.
But I'm wondering if I should use a queue. Could you give me some advice?

[coveralls]

Coverage increased (+1.3%) to 73.425% when pulling 9bb6b5c on pocket7878:skip into 51d692c on jochasinga:master.

[jochasinga]

@pocket7878 thanks for your active contributions. I will check back asap. Meanwhile, before your next PR, can you open an issue for a feature you'd like to add so we can have some discussions there? Also, it might be a good idea to send your PR to the dev branch so we can keep master clean ;)

[pocket7878]

@jochasinga That would be fine :)

[coveralls]

Coverage increased (+1.2%) to 74.672% when pulling 10ae37f on pocket7878:skip into e1b20f6 on jochasinga:master.

[jochasinga]

@pocket7878 can you retract this PR, merge the latest tip back and revise the following:

• rest_skip variable name is not following Go's convention, which requires variable names to be in camelCases like restSkip. However, itself is not descriptive. Can you think of a better variable name that better describe what it holds?

• The parameter named skip in both Skip and SkipLast signature is not descriptive. Try nth

func Skip(nth uint) {
        // ...
}

then resubmit the PR again to the dev branch this time? I'd really appreciate this.

p.s. using a channel for buffering is fine, since channels are basically queues.