Add requirements_extra.txt to easily get optinal dependencies

.travis.yml

@@ -33,6 +33,7 @@ install:
   - pip install coveralls
   - pip install codacy-coverage
   - pip install -e .
+  - pip install -r requirements_extra.txt
 
 before_script:
   - make format

CHANGELOG.md

@@ -16,6 +16,7 @@
 - The `initial_setup.py` file can now be substituted in `settings.py` to customize 
   initial game database state. (volund)
 - Added new Traits contrib, converted and expanded from Ainneve project.
+- Added new `requirements_extra.txt` file for easily getting all optional dependencies.
 
 ### Already in master
 - `is_typeclass(obj (Object), exact (bool))` now defaults to exact=False

evennia/requirements_extra.txt

@@ -0,0 +1,15 @@
+# Requirements for features not active in Evennia by default, but needed for
+# extra functionality and options.
+
+
+# Crypto libraries for SSH support 
+cryptography >= 2.8
+pyasn1 >= 0.4.8
+bcrypt >= 3.1.7
+
+# Library for Telnet-SSL support
+pyopenssl >= 19.1
+
+# AWS-storage contrib 
+boto3 >= 1.4.4
+botocore >= 1.15