Optimize IP comparison

[Menur]

38 has some ideas to speed up library.

Implemented ideas:

• LINQ extensions => for loop
• using offset for IPv4 mapped to IPv6

Gained performance

• Bit.GE : 82.1% time less - 3M calls - 24534 ms -> 4400 ms
• Bit.LE : 81.9% time less - 4 999 911 calls - 33004 ms -> 7063 ms

Tests IPv4 range parse

• 1M calls
• gained 5.42%

IPv6 range parse:

• 999 908 calls
• gained 13.85%

IPv6 Contains - called both LE and GE

• 1M calls
• gained 9.10%

IPv4 Contains - called both LE and GE

• 1M calls
• gained 2.91%

IPv4 mapped to IPv6 Contains - called both LE and GE

• 1M calls
• gained 10.22%

Not implemented:

3. I'm not fully sure it's a good idea.
4. Get hash code takes for IPv4 as the most significant byte the last octet. 1.0.0.255 > 1.0.1.0

[jsakamoto]

Thank you for your contribution!

I'll merge this pull request due to I completed reviewing this pull request.

By the way, this pull request include the changes below:

• Build binary is not compatible with lower version. (ex. Bits.GE(arg0, arg1) is missing.)
• This pull request will fix issue #39 (thank you!), but it will causes broken exist programs those depend on this bug.

Therefore, I'll merge this pull request manually with a few steps for keeping backward compatible.
So, for this work, please give me more few days.