Fix #109

[IvanFeofanov]

Replaced the function memcpy on a universal (little-endian/big-endian) functions varToArr and arrToVar

[mikepurvis]

Thanks very much for looking at this! A few quick questions:

• Which platform(s) are you testing on?
• What is the intended meaning of the varToArr name? I find it kind of opaque; would you consider something like toLittleEndian/fromLittleEndian? Alternatively, http://stackoverflow.com/a/10346064/109517

[IvanFeofanov]

1. Platforms:
   • Atmega328
   • TP-Link TL-MR3020 (big-endian)
   • Linux x86-64 (little-endian)
2. varToArr means copying data from variable to array. This functions work with both big-endian and little-endian.

[mikepurvis]

Just closed and reopened to get a travis test. Looks like there's an issue with size_t not being available?

[mikepurvis]

Great, thanks!