Bring in my pathetic attempts to fix travis

Bring in my pathetic attempts to fix travis

Squashed commit of the following:

commit 38a29ee38abd42afffc380f4911c9ebf99108ffb
Author: Luke Lau <luke_lau@icloud.com>
Date:   Tue Jul 31 13:11:34 2018 +0100

    Remove o2

commit 476b1c64cdeccfc63fe9d06a999d90b50de3a5df
Author: Luke Lau <luke_lau@icloud.com>
Date:   Tue Jul 31 12:37:49 2018 +0100

    Use old test with streaming

commit d1d3ee853d05e1c042119312d0e9d60206ed1bc6
Author: Luke Lau <luke_lau@icloud.com>
Date:   Tue Jul 31 11:48:40 2018 +0100

    Update session.log

commit 19f8f8c406d50454b79fdc3dd669d4090a06ae1d
Merge: bca6e9f 82a682c
Author: Luke Lau <luke_lau@icloud.com>
Date:   Tue Jul 31 11:36:27 2018 +0100

    Merge branch 'master' into travis-investigation

commit bca6e9f14d7f0b49361787ec0601fd2e6ad8854a
Author: Luke Lau <luke_lau@icloud.com>
Date:   Mon Jul 30 23:53:05 2018 +0100

    cd back to build dir

commit b613d081a9df93cfc4b76e50f6d8258499929963
Author: Luke Lau <luke_lau@icloud.com>
Date:   Mon Jul 30 23:24:30 2018 +0100

    Shift comment one line to make it not look like a motivational quote

commit 32d088525bbf4bb2ea3615bb1940c59335b4cb7e
Author: Luke Lau <luke_lau@icloud.com>
Date:   Mon Jul 30 23:17:02 2018 +0100

    Try caching haskell-ide-engine

commit 752ff47e002d4f6062c9fcd3e8f1e6395a6531b6
Author: Luke Lau <luke_lau@icloud.com>
Date:   Mon Jul 30 22:58:06 2018 +0100

    Investigate travis stuff