Both numpy and ipython are included in ERP5 SR which wendelin inherits from, and are pinned there. Here are e.g. latest pin-ups for numpy and ipython in erp5:
e3144a8a (version up eggs.)
135570c9 (version up eggs.)
Furthermore: this is not only a cleanup. As e3144a8a shows current version of numpy in erp5 is 1.10.4 and in wendelin we still have 1.9.2 which is unintentional downgrade compared to erp5.
Don't do that.