Added locator and method for the /explore page

Related to issue48
Added the explore page in pages

Related to issue #48
Added the test_explore_title

Related to issue #48
Added locator and method for the /terms page

Related to issue #47
Added the terms page in pages

Related to issue #47
Added the test_terms_title to verify title

Related to issue #47
Revert "Added the test_terms_title to verify title"

This reverts commit af6550b2eb90c6f116f2d6cd72c0545cd782e3e7.
Revert "Added the terms page in pages"

This reverts commit fde8d0c5f4cd9fda896dc9d15e035cea4eb4205e.
Revert b6e84db..8bdc23b

This rolls back to commit b6e84dbe8d52de5bda386567c904ec4ec7561079.
Removed an extra blank line

Removed an extra blank line
Removed `assert` from explore page object

Removed `assert` from explore page object
Moved `xfail` from class to the test case

Moved `xfail` from class to the test case
Updated to use CSS Selector for explore tab

Updated base.py to find explore tab by CSS_SELECTOR instead of LINK_TEXT
Added import ExplorePage in test_explore.py

Added import ExplorePage in test_explore.py
Removed code from pages/base.py related to other issue

Removed code from pages/base.py related to other issue, will submit in
next pull
Added is_page_title_visible to explore.py

Added method in explore.py to verify that title locator is visible.
Updated test_explore_title to use expected words

Updated test_explore_title to use expected words in assert instead of
variable ‘_page_title’
Removed unused method & added @property

Removed unused method & added @property to is_page_title_visible method
Added  required line breaks to test_explore.py

Added  required line breaks to test_explore.py
Added '.text' to explore.py