Add missing exports

[aalok05]

Description

Fixed a bunch of incorrect/missing imports/exports which were breaking tests.

Type of change

• Added fixes for tests

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run test with success and extended the tests if necessary.
• I ran npm run build and tested the resulting file from dist folder in a browser.
• I have tested my code on the live network.

[coveralls]

Coverage increased (+0.1%) to 93.251% when pulling 046c556 on aalok05:addMissingExports into 1ba3669 on ethereum:ethereumProvider.

[nivida]

Will merge it later into the ethereumProvider branch. Thanks for your efforts!