source cache fixes

CPM_SOURCE_CACHE should now work offline again and on windows.

v0.18

suppress package not found warning in CPMFindPackage (#103)

First version using GitHub releases

From now on, the most recent version of CPM can be downloaded from the according GitHub release as opposed to pulling it from the master branch.

v0.17: add support for SOURCE_DIR argument (#97)

* add support for SOURCE_DIR argument

* simplify code

* add test

* update comment

Default option values

From now on option keys without an explicit value provided are turned "On" by default. Previous versions would fail with a "string begin index out of range error". See #95 for details.

Fixed update warning

Fixes a bug introduced in the v0.15 that broke configuration when a nested dependency has a newer CPM version than the outer project.

Add CPMFindPackage

CPMFindPackage will always try to locate the package via find_package before downloading.
This should be compatible with C++ package managers that are invoked with find_package.

Cache downloaded sources

• Rename CPM_SOURCE_ROOT -> CPM_SOURCE_CACHE
• Adds CPM_SOURCE_CACHE environmental variable support
• Small updates to tests and Readme
• Bugfixes

Add CPM_SOURCE_ROOT option

• Adds CPM_SOURCE_ROOT to use cached downloads

Determine VERSION from GIT_TAG

• Added unit tests
• Determine VERSION from GIT_TAG if not explicitly specified