build: don't panic on git failure

This fixes issue exclave#19, which shouldn't break the build if git fails or is
otherwise invalid.

Signed-off-by: Sean Cross <[email protected]>

exclave: tag v0.2.5

This fixes version control, as well as building outside of git.

Signed-off-by: Sean Cross <[email protected]>

ci: set GIT_VERSION in script.sh and before_deploy.sh

Avoid errors in `build.rs` by setting the git version in bash instead.

Signed-off-by: Sean Cross <[email protected]>

ci: print out environment in before_deploy

We'll use this as a fallback for when git is unavailable.

Signed-off-by: Sean Cross <[email protected]>

ci: add discovery stuff to before_deploy.sh

Turns out this is the script that's failing, not `script.sh`.

Signed-off-by: Sean Cross <[email protected]>

ci: print git location and do ls -la

Still getting more information...

Signed-off-by: Sean Cross <[email protected]>

ci: disable extra targets, add more build.rs output

Try to debug Travis by adding more debug output and disabling extra
targets.

Signed-off-by: Sean Cross <[email protected]>

ci: try to figure out why build.rs is crashing

Try to get more information about the Travis environment, to figure out
why it's crashing exactly.

Signed-off-by: Sean Cross <[email protected]>

exclave: tag v0.2.4

Signed-off-by: Sean Cross <[email protected]>

travis: disable tests on windows

The Travis tests don't run on real Windows, and are missing Powershell.
Or maybe they exist, they're just named "pwsh".  Either way, disable
tests as they are failing due to the lack of a shell.

Signed-off-by: Sean Cross <[email protected]>