Revert "Add the vaex library (includes a test) (#1031)" (#1033)

This reverts commit 411e2f5.

Author: rosbo

Dockerfile

@@ -365,7 +365,6 @@ RUN pip install bleach && \
 
 RUN pip install flashtext && \
     pip install wandb && \
-    pip install vaex && \
     pip install marisa-trie && \
     pip install pyemd && \
     pip install pyupset && \