Add workspace symbol support

Author: gatesn

.circleci/config.yml

@@ -6,7 +6,7 @@ jobs:
       - image: "python:2.7-stretch"
     steps:
       - checkout
-      - run: apt-get install ctags
+      - run: yum install ctags
       - run: pip install -e .[all] .[test]
       - run: py.test test/
       - run: pylint pyls test
@@ -18,7 +18,7 @@ jobs:
       - image: "python:3.4-stretch"
     steps:
       - checkout
-      - run: apt-get install ctags
+      - run: yum install ctags
       - run: pip install -e .[all] .[test]
       - run: py.test test/