Changed links from awslabs to aws and updated version number to 1.0.0 (…

…aws#366)

changelog update for 0.2.0 release (aws#363)

Build fixes (aws#355)

* Make sure AWS_CRYPTOSDK_PRIVATE_GITVERSION is defined in version.h

When build system couldn't detect a git version, this variable
was unset and causing build failures

* Don't run any network tests if AWS_ENC_SDK_END_TO_END_TESTS is FALSE

* Small fix to test to allow it to work on old Red Hat versions

MAP_ANONYMOUS is not defined without it on some older systems

* Update patch version number and changelog

bump version number to v0.1.1 and update change log (aws#354)

Update README.md. (aws#348)

* Update README.md.

* Add additional Windows build requirement
* Add link to API documentation
* Highlight recommended shell to use for Windows setup

* Wording tweak to README.md.

Per PR feedback.