cpplinq-20140323

What's new in this release:
1. Minor tweaks (whitespaces, closure captures and so on)
2. Preparing for noexcept (CPPLINQ_NOEXCEPT macro)
3. Added opt::clear
4. Reworked how from range sources iterates in order to reduce overhead
5. Added ref () which takes range of references and wraps it in std::reference_wrapper. Useful when storing references in a STL collection.

Thanks to:
1. nitrogene38 - For requesting ref ()

cpplinq-20130810

What's new in this release:
1. Non standard #pragma once replaced with header guards
2. first() added
3. throw() removed from range::operator>> (in order to enable operators such a first() to throw on empty sequences)
4. const correctness fixes
5. code style fixes
6. Returns reference to locally scoped instance fixed

Thanks to:
1. breyed - for the implementation of first() and discussions regarding the return value semantics of cpplinq.
2. stl - for sorting out a bug in cpplinq regarding exceptions.
3. mwpowellhtx - for pointing out that #pragma once is non standard

Added x64 build configuration to CppLinq.Mini

Fixing case: climits should be included for INT_MAX, in addition fixi…

…ng from_copy to use perfect forwarding to minimize unnecessary copying.

Updated .gitignore

- added sum(selector), min(selector), max(selector), avg(selector), a…

…ggregate, to_list, repeat(), empty<T>()

- added tests for the new operators
- fixed code formatting tabs vs. spaces
- arranged the operators by category

Added #pragma once

Changed sum test to become a test focusing on testing the overhead ad…

…ded of CppLinq compared to handwritten loops.