Improve Travis CI setup -> compile all executable

[wilzbach]

As I wanted to enable a Travis CI compilation check for #203, I realized that further cleanup needs to be done. Thus here are the Travis CI enhancements - the commit messages should be explanatory.

I removed digger in favor of custom cloning as the posix.mak requires the typical dlang structure.

[CyberShadow]

I removed digger in favor of custom cloning as the posix.mak requires the typical dlang structure.

Sorry, what was the problem? Digger invokes the Tools makefile just fine (use --with=tools).

[wilzbach]

Sorry, what was the problem? Digger invokes the Tools makefile just fine (use --with=tools).

Yes, but we need to pass in a custom list of scripts to be build a la make -f posix.mak dget tolf (as changed.d is broken atm). Also cloning the repos manually creates more similarity with the other build scripts.

[CyberShadow]

Also cloning the repos manually creates more similarity with the other build scripts.

What is the effective difference between Digger's repository layout and the one done here?

[MartinNowak]

Looks sensible

What is the effective difference between Digger's repository layout and the one done here?

For example the shell script builds pull requests against the correct base branch, e.g. stable or feature branches.
Also cloning digger and it's dependencies, plus relying on the bitbucket repo adds a lot of failure points to a CI system, just to replace a snippet of shell script. And effectively errors would be harder to understand for anyone not familiar with Digger's architecture.

[MartinNowak]

Missing make -j$N -C src -f posix.mak MODEL=$MODEL HOST_DMD=$DMD dmd.conf after that, hence the failure with rdmd.

[wilzbach]

Superseded by #233