Additional Logging During Tree Sync

[dills122]

Added additional logging statement to the beginning of the syncTree method to alert users when the processes kicks off since the process could take a few seconds to complete.

[pinheadmz]

Closes #660

Thank you for contributing!

[coveralls]

Pull Request Test Coverage Report for Build 1559029358

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.008%) to 62.5%

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Files with Coverage Reduction	New Missed Lines	%
lib/covenants/rules.js	1	69.11%
lib/protocol/consensus.js	1	82.79%

Totals
Change from base Build 1558293960:	-0.008%
Covered Lines:	21240
Relevant Lines:	31793

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💛 - Coveralls

[pinheadmz]

@dills122 I want to thank you again for your contribution ;-) However at the same moment you were writing this PR I was about to close this same issue in this PR: #669

If you wanna update your branch with the wording I chose for this log message, I'll merge yours first and then rebase so you get the commit ;-)

[dills122]

@pinheadmz No problem! Hoping to get involved more here going forward. Thanks for giving me the commit 😄

[nodech]

Hey, thanks for the contribution !

Can you squash the commits ? That makes master history cleaner w/o redundant commits from the PR.

[nodech]

ACK 8e2e3b4

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