Optimized RAM, more options

Optimized RAM usage from being up to infinity to ≈100MB (it depends on VOD duration).

Added:

• -info, -cpuprofile, -memprofile options.

Fixed:

• Errors (if exists) now printed in the correct stream (stderr)
• Typos

Main functions

This is the very first release.

It does all functions that described in -help:

• download a full VOD
• download a part of a VOD
• choose a certain quality of a VOD
• print time info
• print debug info

-info flag does not work for this release