Use Travis' csharp language setup

Use the configuration Travis already knows about to reduce how much custom code we're running. As it's now easy to do, test on both 3.12 and 4.2 versions of mono. This also has the advantage of making us test on both systems with the same version.

Author: carlosmn

.travis.yml

@@ -1,7 +1,10 @@
 # Travis-CI Build for libgit2sharp
 # see travis-ci.org for details
 
-language: c
+language: csharp
+mono:
+ - 3.12.0
+ - 4.2.3
 
 os:
  - osx
@@ -14,11 +17,9 @@ env:
 before_install:
  - date -u
  - uname -a
- - export PATH=/opt/mono/bin:$PATH
  - env | sort
 
-# Make sure CMake and Mono are installed
-install: ./CI/travis.${TRAVIS_OS_NAME}.install.deps.sh
+solution: LibGit2Sharp.sln
 
 # Build libgit2, LibGit2Sharp and run the tests
 script:

CI/travis.linux.install.deps.sh

@@ -9,10 +9,6 @@ EXTRADEFINE="$1"
 # working directory in its library search path, so it works without this value.
 export LD_LIBRARY_PATH=.
 
-# Required for NuGet package restore to run.
-mozroots --import --sync
-
-mono Lib/NuGet/NuGet.exe restore LibGit2Sharp.sln
 xbuild CI/build.msbuild /target:Deploy /property:ExtraDefine="$EXTRADEFINE"
 
 exit$?