Merge pull request #26 from josevcm/develop

Merge pull request #25 from josevcm/master

clarify RTLSDR documentation

update version 2.8.2

Merge branch 'release/2.8.1'

Merge branch 'release/2.8.0'

Merge branch 'develop'

build scripts

change title version to 2.6.4

prepare release 2.6.2

prepare for 2.6.0