Added testcase for NfsOptions library
Refactoring of NfsOptions

- RYCP converted to Ruby
Added missing options from `man mount`
Build-related changes

- Added changes file entry
- New version
- Adapted spec file to include rubygem-rspec
Added test for bnc#848768

use the actual options reported in the bug
gitignore: autodocs, test artifacts
A bit nicer checking for incorrect values in mount options
A bit more descriptive tests
More unerstandable descriptions
Updated test - options that do not expect values but have some

- Found by @jreidinger
- This should produce a different error message
Reworked checking for invalid options
Adapted old tests for new error message
Merge pull request #16 from yast/refactor-nfs-options

Refactor nfs options